“What is interesting about repugnance is how it shifts over time. My favorite example is life insurance. Until the mid-19th century, this concept was widely held to be repugnant – it meant placing a bet, after all, on the untimely death of a loved one. … [But there’s] something that’s perhaps even more interesting: the opposite of repugnance … ‘transactions that, as a society, we often seek to promote, for reasons other than efficiency or pure political expediency.'”